Fire door closers: how to test, adjust and replace them

The self-closing device is the part of a fire door that does its job when nobody is thinking about it. A fire door only holds back fire and smoke when it is shut, and in an emergency people rarely stop to close doors behind them. Fire door closers make sure the door returns to its frame and latches every time it is released, which is why a closer that has stopped working quietly turns a certified fire door into an ordinary one.

Checking a closer takes seconds and needs no tools. Open the door fully and let it go, then open it only a short way and let it go again. Both times it should close completely and engage the latch on its own. This guide explains why that matters, the types and standards involved, the faults we see most often, and when to adjust or replace.

Why the self-closing device is essential

A fire door is designed and tested as a complete doorset: leaf, frame, seals, hinges, ironmongery and closer. Fire resistance testing to BS 476-22 or BS EN 1634-1 is carried out with the door closed and latched. An open door, or one resting against the frame without the latch engaged, gives smoke and fire a clear path into the escape route it is meant to protect.

Approved Document B expects fire doors to be self-closing, with limited exceptions such as cupboards and service ducts kept locked shut. Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must keep fire safety measures, including fire doors and their closers, in efficient working order and good repair.

In residential buildings over 11 metres, the Fire Safety (England) Regulations 2022 require quarterly checks of communal fire doors and annual best-endeavours checks of flat entrance doors. The same regulations require residents of multi-occupied residential buildings to be told that fire doors should be kept shut when not in use and that self-closing devices must not be tampered with.

Types of fire door closer and the standards behind them

Most closers on fire doors fall into one of three groups:

• Overhead face-fixed closers. The most common type, fixed to the leaf or frame head with an arm linking the two. They are easy to inspect, adjust and replace.
• Concealed closers. Fitted within the leaf and frame head, or in the hinge edge and jamb, so nothing shows when the door is shut. Because they involve routing into the leaf and frame, they must be specifically covered by the doorset's fire test evidence, and some lighter units struggle to close heavier doors.
• Floor springs. Set into the floor beneath the door, with the leaf pivoting on top. They suit heavy, glazed or double-action doors and must be approved for use with that doorset.

Whatever the type, a closer on a fire door should be tested and classified to BS EN 1154, the standard for controlled door closing devices, and carry CE or UKCA marking. Its classification confirms whether it is suitable for use on fire and smoke doors.

Closers are also rated by power size, from 1 up to 7, with higher numbers intended for wider, heavier doors or doors exposed to wind and air pressure. Fire doors generally need at least power size 3. Too little power and the door will not overcome its seals and latch. Too much and it becomes hard for children, older people or anyone with limited strength to open.

How to test fire door closers

A caretaker, landlord or building manager can carry out this simple test as part of routine checks:

1. Open the door fully and release it. It should close under its own power without being pushed.
2. Open the door to a small angle, roughly 10 to 20 degrees, and release it again. This is where weak closers most often fail, because the door has little momentum to carry it past the seals and latch.
3. In both tests, confirm that the door closes fully into the frame and the latch engages, overcoming any resistance from smoke seals, intumescent strips or the latch itself.
4. Watch as it closes. It should move smoothly, without slamming, stalling or bouncing off the frame.

A door that stops short of the latch, or needs a push to click shut, has failed and should be put right promptly. This quick test does not replace a formal inspection, and our guide to how often fire doors should be inspected explains where routine checks end and competent inspection begins.

Fire door closer not closing? The common faults

The same faults come up again and again:

• Leaking hydraulic fluid. Oil staining on the closer, door or floor means the internal seals have failed. The closer cannot be refilled and needs replacing.
• Loose or damaged arms. Worn fixings, bent arms and loose joints stop the closer transferring its force to the door.
• Wrong power size. A closer too weak for the leaf, or left in place after heavier seals were fitted, will not latch the door reliably.
• Closer disconnected. Arms are sometimes unhooked, or the closer removed, because the door was thought too noisy or heavy.
• Door propped or wedged open. Wedges, hooks and even fire extinguishers are still common in corridors, and they defeat the closer entirely.
• Door binding on the frame or floor. A dropped leaf, swollen timber or new floor covering can stop even a healthy closer from shutting the door.

A closer is often blamed when the real problem is the door itself, and our article on fire door gaps and the 3mm rule explains how a dropped or binding leaf stops a door closing. Disconnected closers and wedged doors are usually a sign that a door is fighting against the way the building is used.

Hold-open and free-swing devices under BS EN 1155

Some fire doors genuinely need to stand open. In care homes, residents may find a self-closing door too heavy to open safely, and in busy corridors in hotels, schools and offices, constant opening and closing is exactly what leads to wedging. The compliant answer is an electrically powered hold-open device or free-swing closer to BS EN 1155, linked to the fire alarm.

A hold-open device keeps the door open at a set position, through a closer with a built-in mechanism or an electromagnetic retainer on the wall. A free-swing closer lets the door move like an ordinary door with no closing force. Either way, the device releases when the fire alarm operates or the power fails, and the door then closes and latches under the full force of the closer.

Whether a device suits a particular door should be decided through the fire risk assessment, and the release should be tested regularly alongside the alarm. Our page on fire doors for care homes covers care settings in more detail.

Fire door closer adjustment or replacement

Adjustment is the right answer when the closer is intact and correctly sized for the door, but its action has drifted over time. Most hydraulic closers have two small valves on the closer body:

• Closing speed controls how quickly the door travels through most of its arc, from fully open to the last few degrees.
• Latching speed controls those final few degrees, giving the door a controlled push to overcome the seals and engage the latch.

Adjust in small steps, a fraction of a turn at a time, and retest after each change. Unscrewing a valve too far can let fluid escape and ruin the closer. If sensible adjustment does not produce a smooth close and a reliable latch, the fault lies elsewhere.

Replacement is needed when the closer is leaking, damaged or no longer responds to adjustment, when it is the wrong power size, when there is no evidence it is suitable for fire doors under BS EN 1154, or when a hold-open or free-swing device would now be more appropriate.

Any replacement must be compatible with the doorset's certification. The fire test evidence sets out which closers, fixings and routing are approved, and fitting something outside that scope can compromise the whole door. Where documentation is missing, a competent inspector working to BS 8214 can advise on a suitable replacement. Keep a record of what was fitted and when, which for higher-risk buildings under the Building Safety Act 2022 forms part of the golden thread.

Fire door closer checks and repairs in Norfolk

Closers are one of the most frequent findings on the fire door inspections we carry out, and one of the easiest to put right when caught early. Access Fire Doors is FIRAS certified and NVQ Level 3 qualified, based in Wymondham and working across Norwich, Dereham, Attleborough, Thetford, Great Yarmouth, King's Lynn and the rest of Norfolk, as well as Suffolk and London. We can test every closer in a block of flats, HMO, care home or hotel, adjust or replace those that need it, and give you a clear record of the work. You can read more about our fire door inspection, installation and maintenance services.

If you have doors that slam, doors that will not latch, or corridors where the wedges keep coming back, contact our team to arrange an inspection, call 07717 751004 or message us on WhatsApp. We will give you a straightforward picture of what your doors need.

The Access Fire Doors team